What's the best was to make triangular shaped stripes?

I need to make stripes for a cake in a triangular shape that don't overlap in the middle. Any tips on how to make them evenly sized, spaced and best way to transfer them? I need it to look like this: http://www.google.com/imgres?imgurl=http://4.bp.blogspot.com/-jf41-OWtsUY/UHsDBtJa3qI/AAAAAAAACeM/K_YnE2zRzvU/s1600/Barcelona%2BFC%2Bwith%2Bball%2Bfor%2Bblog.jpg&imgrefurl=http://nadia-zucchelli.blogspot.com/2012/10/barcelona-football.html&h=1048&w=1116&sz=280&tbnid=Ae70ZDoD6pMkGM:&tbnh=90&tbnw=96&zoom=1&usg=__5UxaaPx9bLOEI8lPx0WtQUVVoYY=&docid=c8RwtZ_XI0S-4M&sa=X&ei=A_FHUtXrM_fi4AOTwIDoCQ&ved=0CDEQ9QEwAA

A pattern is a great idea. A round cake is really just a big circle that has been "bent" part way up.

I'd measure the circumference of the cake [I use cash register tape to do this]. Cut a circle of parchment paper, cardboard, etc. the size of the circumference. Divide the circle into however many "stripes" you want. The more the stripes, the "straighter" they'll seem on the sides of the cake, but they'll taper off toward the center of the top. Cut out & place all stripes carefully, but expect to have to custom fit the final 1 or 2.